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English definition of “professional”

professional

adjective uk   /prəˈfeʃ.ən.əl/ us  
B2 related to work that needs special training or education: Chris, you're a nurse, so can I ask your professional opinion on bandaging ankles? Both doctors have been charged with professional misconduct (= bad or unacceptable behaviour in their work). B1 approving having the qualities that you connect with trained and skilled people, such as effectiveness, skill, organization, and seriousness of manner: It would look more professional if the letter was typed. She always looks very professional in her smart suits. You've done a very professional job stripping that floor! B1 describes someone who does a job that people usually do as a hobby: She's a professional dancer/photographer. He's a runner who's just turned professional. having the type of job that is respected because it involves a high level of education and training: Room for rent in shared house - would suit professional person. a bar full of young professional types in suits

professional

noun [C] uk   /prəˈfeʃ.ən.əl/ us  
C1 a person who has the type of job that needs a high level of education and training: health professionals informal someone who has worked hard in the same type of job for a long time and has become skilled at dealing with any problem that might happen: I thought the whole meeting was going to fall apart but you rescued it like a true professional! the consummate professional B2 a person who does a job that people usually do as a hobby: He's only been playing football as a professional for two years. a person who plays sport, especially a golf or tennis player, who is employed by a club to train its members in a particular sport
(Definition of professional from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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